Appendix G – Probe Comparison
Model 924 and 924B Magnetostrictive Probe Probe Comparison
Starting in October 2006, OPW Fuel Management Systems began switching from the Model 924
magnetostrictive probe to Model 924B probe. While taking on a new physical appearance, the Model 924B
probe is fully backward compatible with all SiteSentinel family ATG consoles, as illustrated below:
• Compatible with all current SiteSentinel family ATG controllers.
• Same installation procedures, including wiring, I.S. barrier, floats and cable.
• Same configuration procedures
• Capable of EPA 0.1 GPH (0.36 liter per hour) and 0.2 GPH (0.76 liter per hour) leak detection
• Both certified to UL/US/Canada, ATEX and additionally on the model 924B IECEX
While fully backward compatible with the Model 924, the 924B is engineered with the following improvements:
• Available EPA 0.1 GPH (0.38 liter per hour) leak detection now third-party certified with 2 in (5 cm)
diameter floats
• All stainless-steel construction (stainless probe head and probe shaft)
• Conformal-coated circuit board with 100% Surface Mount Components
• Smaller overall head diameter [0.2 in (3 cm) diameter] and shorter probe head [8 in (20 cm) long]
Ordering the New Probe
As for order entry, the same probe length calculation is kept while changing the model/part number from 30-
EAxxx to 30-Bxxx. For example, if ordering a probe for a 4 ft (122 cm) diameter tank, instead of part number
30-EA053 for a 924 probe, you should now order 30-B053. Other probe sizes, and their part number
correlation, are shown in the table below:
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